class_docstr: Tree node of a dendrogram.
code: def __init__(self, value, *children):
      self._value = value
      self._children = children
  
imports: import copy
  from abc import abstractmethod
  from math import sqrt
  from sys import stdout
  from nltk.cluster.api import ClusterI
label_desc: Use image node_id 1 to create a new _DendrogramNode object  with example: obj = _DendrogramNode(value)